#include "spi.h"

void SPI1_Init(void)
{
	GPIO_InitTypeDef  GPIO_InitStructure;
	SPI_InitTypeDef  SPI_InitStructure;

	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
 
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_Init(GPIOB, &GPIO_InitStructure);

	GPIO_PinAFConfig(GPIOB,GPIO_PinSource3,GPIO_AF_SPI1);
	GPIO_PinAFConfig(GPIOB,GPIO_PinSource4,GPIO_AF_SPI1);
	GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_SPI1);

	RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,ENABLE);
	RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,DISABLE);

	SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
	SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
	SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
	SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
	SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
	SPI_InitStructure.SPI_CRCPolynomial = 7;
	SPI_Init(SPI1, &SPI_InitStructure);

	SPI_Cmd(SPI1, ENABLE);

	SPI1_ReadWriteByte(0xff);
}   

void SPI1_SetSpeed(u8 SPI_BaudRatePrescaler)
{
	assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_BaudRatePrescaler));
	SPI1->CR1&=0XFFC7;
	SPI1->CR1|=SPI_BaudRatePrescaler;
	SPI_Cmd(SPI1,ENABLE);
} 

u8 SPI1_ReadWriteByte(u8 TxData)
{
	while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){}

	SPI_I2S_SendData(SPI1, TxData);

	while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){}

	return SPI_I2S_ReceiveData(SPI1);
}

